25802521 has 2 divisors, whose sum is σ = 25802522. Its totient is φ = 25802520.

The previous prime is 25802519. The next prime is 25802531. The reversal of 25802521 is 12520852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 7096896 = 4325^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 25802521 - 2¹ = 25802519 is a prime.

Together with 25802519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25802531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12901260 + 12901261.

It is an arithmetic number, because the mean of its divisors is an integer number (12901261).

Almost surely, 2^25802521 is an apocalyptic number.

It is an amenable number.

25802521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25802521 is an equidigital number, since it uses as much as digits as its factorization.

25802521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 25802521 is about 5079.6181943134. The cubic root of 25802521 is about 295.4976604134.

The spelling of 25802521 in words is "twenty-five million, eight hundred two thousand, five hundred twenty-one".